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7.5ct Tourmaline (Round, 12.8×12.8mm, Purple) vs 7.5ct Sapphire (Round, 11.7×11.7mm, Blue)


Quick summary: When looked from above (face-up position), 7.5ct Tourmaline (12.8×12.8mm, round cut) appears 20% larger than 7.5ct Sapphire (11.7×11.7mm, round cut). See below how they compare side-by-side on a ring and finger.

7.5ct Tourmaline (round cut)
vs
 7.5ct Sapphire (round cut)
purple
 
blue
12.8×12.8 mm 11.7×11.7 mm
actual size
Actual size of 7.5ct Tourmaline (round cut, 12.8×12.8mm, Purple color)   Actual size of 7.5ct Sapphire (round cut, 11.7×11.7mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Purple 7.5ct Tourmaline (round cut, 12.8×12.8mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 7.5ct Sapphire (round cut, 11.7×11.7mm) on a right ring and finger
Your settings
Ring
 Gold
Skin tone
 Light
Ring diameter
 16.9 mm
Ring width
 3.0 mm
Finger length
 64 mm
Finger coverage
 76% vs 70%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 7.5ct Tourmaline Round (12.8×12.8mm, Purple) and 7.5ct Sapphire Round (11.7×11.7mm, Blue) as they would appear on a ring and finger. Adjust the ring and finger size to get an idea of how these gemstones would look on your finger.

Where to buy?

For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile

Face-up Size

All things being equal, Sapphire will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (4 vs. 3.06 - this means it's "heavier" compared to Tourmaline of the same size). Face-up size also depends heavily on the proportions of the cut.

Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.


7.5 Ct Tourmaline (Round) 7.5 Ct Sapphire (Round)
12.8×12.8 mm vs 11.7×11.7 mm
128.68 mm²   107.51 mm²
Face-up size outline for 7.5ct Tourmaline (12.8×12.8mm, round cut)
Face-up size outline for 7.5ct Sapphire (11.7×11.7mm, round cut)
7.5ct Tourmaline Round (12.8×12.8mm)
7.5ct Sapphire Round (11.7×11.7mm)
Difference: 20% (21.17 mm²)
7.5ct Tourmaline (Round, 12.8×12.8mm) has approx. 20% more face-up area than 7.5ct Sapphire (Round, 11.7×11.7mm).


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